I designed and built this oscilloscope in 1986
using the chassis of a non-working vacuum tube oscilloscope,
keeping only the original high voltage vacuum tube supply and
CRT. This construction project is only for the experienced
designer, since you will want to change and adapt parts of the
circuit to accommodate new semiconductors and devices. I
recommend that you do not build an oscilloscope from these
schematics, but rather, understand the design principles and come
up with a more modern design. The bandwidth can easily be
extended beyond 100 MHz by using inexpensive high speed drivers
and op-amps. Delayed sweep, and other features, are easy to add.